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Given below are the quantum num bers for 4 electrons. A. n = 3,  = 2, m 1 = 1, ms = +1/2 B. n = 4,  = 1, m 1 = 0, ms = +1/2 C. n = 4,  = 2, m 1 = – 2, ms = – 1/2 D. n = 3,  = 1, m 1 = – 1, ms = +1/2 The correct order of increasing energy is :

1. D < B < A < C
2. D < A < B < C
3. B < D < A < C
4. B < D < C < A

Correct answer: D < A < B < C

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